Problem 2 solved : sum of even fibonacci numbers

Def a generator for fibonacci numbers, then sum the even one.
Fix some typo on the license
Fix some typo on the license
Resolve problem 3 : Get the largest prime divisor

This method is kind of brutal : check the modulo of the number with all prime number lower than its half.
Fixes issue when the largest prime was exactly the half
Problem 4 : get the largest product of 2 3-digit number making a palindrome

Add an is_palindrome function
Problem 4 : get the largest product of 2 3-digit number making a palindrome

Resolve the problem